Relief-valve.



Patented Julie I0, I902.

F. SCHREIDT.

RELIEF VALVE. (Appliceion filed Oct. 7, 1901.)

2 Sheets-Sheet I.

(No Model.

I i Elniintoz I l vi human No. 7u2,|57.. Patented lune I0, I902. j F.SGHREIDT.

RELIEF VALVE.

7 (Application filed Oct. 7, 1901.)

(No Model.) 2 Sheets-Sheet 2,

. anwnl'ozi and State'of'Ohio, have invented certain new UNITED STATESPATENT OF CE.

FRANK soHREIDT, or" MANSFIELD, OHIO.

RELIEF- VALVE.

" 'SPEGIFICAT'ION forming part of Letters Patent no. 702,157, dated June10, 1902.

ApplicationfiledQetober'h 1901.

To all whom it may concern.- Be it known that I, FRANK SoHREID'r, acitizen of the United States of America, and a resident of Mansfield,inthe county of Richland and useful Improvements in Relief-Valves, ofwhich the following is a specification. v The object of my invention isa relieffv'alve which is held shutfnot by a'spring that is IO regulatedto a certain tension ,whichhwhen exceeded allows thevalve to openfor theescape of water of condensation, but by steam upon the live-steam end ofthe cylinder andwhich is opened upon the exhaust end ofthe I 5 cylinderfor the escape of the water of con densation, either by any pressure ofthe water which is great enough to lift the weight of the valve orisheld open constantly when there is no steam-pressure upon it.This'object is attained by the means described in the specification,particularly pointed out in' the claims, and illustrated in theaccompany- 7 *ing drawings, in w-hi'ch- .7

Figure 1 is a longitudinal vertical central. 2 5 sectional view of arelief-valve embodying my invention. Fig. 2 is a horizontal sectionalview of the same, taken upon lin'ezz of Fig. 1. Fig. 3 is a detailperspective view of the main valve. .Fig. 4 is a detail end view'of thecams stem of the hand-wheel for lifting the main valve. Fig. 5 is aviewysimilar to Fig. 1, of a modified form efv'alveg 'Fig56is a sec-:tionalvlew ef'thesafilfertaken'upon line 1; v of Fig. 5. Fig. 7 isadet'ail plan view, of the auxiliary valve. Fig. 8' is a similarview ofthe main valve. Fig. 9 is an inverted plan view of the in'ain valve. V I

Referring toFigs. 1 toe, cylinder-easing A of the main valve'has alateral externally-screw?- threaded extension a 'tobe screwed into the Iend of a steam-cylinder. At its lower end casing A has aninwardly-projecting horizontal flange, which forms seat a for main valve13, and an exteriorly-screw-threaded extension a the lower end ofwhichforms the seat for the -secondary "valve 0; whose valve-case. c isinteriorly screw-threaded at each of its ends, the upper end to engageextension a and the lower to,be connectedrto an exhaust- Casing c has across-bar 0 formed integral with it, which has a central perfora tionthrough which the stem 0 of secondary Serial no. 77,805. (No model)valve 0 projects." The valve is held yieldingly to its seat by alightspring 0 Above extensiono a by-pass a is "integral with easing A andcommunicating with a port 0L -in'the walls of the casing.

:The upper enchof the casing is closed by a Main valve B has near itsupper end 'alarge horizontal'fiange'b, whichfits against the walls ofthe casing and when the valve is upon its seat comes just below port a,so as to leave it uncovered. Above flange b the main valve. "hasfla cup17 upon. the sides of which arever; tic'alwings b to contact the innerwalls of I cap D to assist in guiding the main valve to and from itss'"eat, a function inv which they formed are assisted by wings bfat thelower end of l the m'ain'valve, which contact theinner walls ofextension a [Below flange b is a'flange '6", under whichthe cam-shapedend of stem 6 of hand-wheel E projects, so that the valve may be'liftedfrom its seat at will by turning the hand-wheel.

In use when the end of the cylinder is filled with live steam itpasses'throu'gh port afin on top of flange band into cup 19 and the areathereof being much greater than that upon the under side of saidflange'holds the main valve firmly to its seat. When the steam has beenexhausted, should there-be anywaterof condensation left in the end ofthe cylinder the piston car'riesjit into casing A, and as the waterrise's therein it comes in contact with the under side of fiangebbeforeit reaches port afl raises the main valve 01f of its seat; and carriesup flange b, thereby covering port aflpreventing water enteringabove theflange, "so that the valve remains thrown from its seat to allow thewater to escape past secondary valve 0, which had been held up to itsseat with a pressure just sufficientto counteract its weight. Thepurpose of valve 0 is to prevent outside air from raising valve B andget- .ting into the casing when steam isexhausting from the cylinder.

In the modification shown in Figs. 5 to 9 casing A has an upperexternally. screwthreaded extension at", which is to be screwed into asteam-cylinder, and a lower-internallyscrew-threaded extension at, whichreceives a coupling F, the upper end of which forms valve-seat) of mainvalvefi and the lower end of which is to be connected to an exhaustpipe.Connected to theinner walls of easing A by arms a is an inverted cup anear the lower edge of which is a slot a". Main valve G consists of acylindrical shell having an enlargement g at its top to fit snuglywithin cup a so that when the valve is seated its upper edge comes belowslot a and leaves it unobstructed. Main valve G has near its lower endan internal annular flange g, which forms the seat for a secondary valveH, which consists of an inverted cup having an upwardlyprojecting stemh, which passes up through a perforation in top of cupa. Valve 11 haswings 72" upon its sides which contact the walls of main valve G, andthrough its upper end passes a pin 7L2, which projects into enlargementg to limit the upper travel of valve l'I. Between wings h and collar gis a coiled spring W.

In use upon the live-steam end of the cyl' inder the steam entersthrough slot a in upon top main valve G and secondary valve H, carryingthe latter toits seat. Upon the exhaust side spring h lifts valve H fromits seat. Any water ofcondensation coming with pressure against theunder side of enlargement g raises the main valve, closing slot at toprevent any pressure coming on top of the valve, and allows the water tobe discharged from the casing. Should the water accumulate in smallquantities in the valve-casing, so thatit exercises no pressure againstthe under side of enlargement g, and if valve H were not held open byspring 72,3 to allow the water that gets in' on top of it to escape,this water would upon a large quantity of water coming into the valveunder pressure prevent the valve from opening. springh however, opensvalve II upon the exhaust end of the cylinder and allows the water thathas accumulated to escape, thus keeping the valve in working conditionfor action should a large quantity enter the valve under pressure.

Vhat I claim is 1. In a relief-valve a casing having an inlet and anoutlet opening, a main valve therein normally closing the outlet-openinghaving an enlarged upper end contacting the walls of the casing andforming therewith a closed chamber above the valve, said chamber havinga slot in its Walls situated above the normal position of the upper endof the valve and placing the chamber in communication with the interiorof the casing, substantially as shown and described.

2. In a relief-valve a casing having an inlet and an outlet opening, amain valve therein normally closing the outlet-opening having anenlarged upper end contacting the walls of the casing and formingtherewith a closed chamber above the valve, said chamv her having a slotin its walls situated above the normal position of the upper end of thevalve and placing the chamber in communication with the interior of thecasing, and a handwheel having its stem passing through the casing andengaging the main valve for lifting it from its seat when desired,substantially as shown and described.

3. In a relief-valve the combination of a casing having an inlet and anoutlet opening, a main valve therein seated against the outlet-openingand consisting of 'a shell having an internal flange and an upperenlarged end contacting the walls of the casing and fortning therewith aclosed chamberabove the valve, said chamber having a slot in its wallssituated above the normal position of the end of the valve and placingthe chamber in communication with the interior of the casing, a

secondary valve to be seated downward

